Question

3. In an AP:
(i) given a = 5, d = 3, a, = 50, find n and S.​

Answer 1

Answer:

an= a+(n-1)d

Step-by-step explanation:

50=5+(n-1)3

by solving we get n=16

S=n/2 [2a+(n−1)d]

putting all the values we get

S=16/2[(2*5)+(16-1)*3]

S=440